Skiascope.



No. 696,350. Patented Mar. 25, I902.

K. A. MOTT.

SKIASGOPE.

(Application filed Nov. 1, 1901.; (No Model.) 2 Sheets-Sheet ll IN VE NTOR Kirk 3?. flail ma ncnms FEYERS coy. PHOTO'UTHQWASHINCITON, c, c.

N0. 696,350. Patented Mar. '25, I902.

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SKIASCOPEV (Application flledvflov. 1, 1901.)

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UNITED STATES PATENT OFFrcE.

KIRK A. MOTT, OF AVALON, MISSOURI.

SKIASCOPE.

SPECIFIGATIGN forming part of Letters Patent No. 696,350, dated March25, 1902.

Application filed November 1, 1901. Serial No. 80,825. (No model. I

To all whom it may concern.

Be it known that I, KIRK A. MOTT, a citizen.

of the United States, and aresident of Avalon, in the county ofLivingston and State of Missouri, have invented a new and ImprovedSkiascope, of which the following is afull, clear, and exactdescription.

The invention relates to instruments for examining and testingthe-visual power of persons; and its object is to provide a new andimproved skiascope which is simple and durable in construction andarranged to permit of quickly bringing a single lens or. any desiredcombination of lenses into proper position for viewing one eye of apatient, at the same time relievingthe other of undue strain. I

The invention consists of novel features and parts and combinations ofthe same, as will be fully described hereinafter and then pointed out inthe claims. 7

A practical embodiment of the invention is represented in theaccompanying drawings, forming a part of this specification, in whichsimilar characters of reference indicate corresponding parts in all theviews.

Figure 1 is a side elevation of the improvement.Fig.2isalongitudinalsectionalelcvation of the same on the line 2 2 ofFig. 3. Fig. 3 is a sectional plan view of the same. Fig. 4 is an endview of the same. Fig. 5 is a transverse section of the same on the line5 5 of Fig. 3, and Fig. 6 is a perspective view of the actuatingmechanism for a lens.-

On a suitably-constructed stand A is mounted acasing B, in which extendslongitudinally a sight-tube C, projecting at the open end 0 somewhatbeyond one end of the casing, the other end 0 of the sight-tube being inthe form of an aperturcd diaphragm located a distance from the eyepieceD of the patient, the said eyepiece being in axial alinement with thesight-tubeC and secured to a spider or cross-piece D, carried by thecasing B. From the outer open end 0 of the sight-tube G extends upwardlyand forwardly and at an angle a light-supply tube E, carrying a lamp Fof any preferred construction and arranged to throw rays of lightthrough an aperturcd diaphragm E and through an adjustable aperturcdslide G to an aperturcd hand-mirror H, held by the operator between theend 0 of the sight-tube (land the eyeof the operator. The slide Gextends in the light-tube E and is providedwith asuitable handle G,projecting through an elongated aperture E formed in the light-tube E tobring the rays of light in proper'position relative to the hand-mirror1-1., Into the space between the inner end 0 of the sight-tube O and theeyepieceD are adapted to be moved sets of lenses I and I, of which thelenses I are a set of posi tive lenses ranging in regular order, say,from O25 to 40 0D.andthe lenses 1 are a negative set ranging in regularorder from-O25 to 400D. The lenses in each set are spaced apart andnormally stand out of alinement with the sight-tube Gin the lowerportion of the casing B, as plainly indicated in Fig. 5. Each of thelenses Iis mounted in a frame J, and the several framcsJ are fulcrumedon a pin J, carried by the casing B, and each frame J is pivotallyconnected by a crank K with an arm L, projecting from a rock-shaftN,journaledin suitable-bearings in the casing B and extendinglongitudinally therein. On the forward end of each rock-shaft N issecured a crank-arm O, engaged by a bearing P on a slide P, mounted toslide transverselyin suitable bearings arranged in the casing 13..

The outer end of each slide P is provided with a button P bearing thenumber of the corresponding lens and under the control of the operator,and the inner end of each slide P is pressed on. by a spring P tonormally hold the slide and connected partsin the'position shown in Fig.5that is, with the lenses I standingin the lowermost inactive position.

When the operator presses one of the buttons P the inward movement ofthe slide P causes a rocking of the rock-shaft N, so that by the arm Land linkK of this rock-shaft a swinging motion is given to thelens-frame J to swing the lens I into axial alinementwith the sight-tubeO and eyepiece D. As soon give the value of the corresponding, negativelenses I, and the said buttons are preferably arranged on the saidcasing B above the buttons P. 7

From the foregoing it will be seen that by the operator pressing any oneof the buttons P P any desired lens can be moved in axial alinement withthe sight-tube C and bypressinga number of the buttons any desiredcombination of lenses can be brought in. register or alinement with thesight-tube C.

The device isused as follows: The eye of the patient to be examined isbrought in close proximity to the eyepiece D and the observer views theeye by looking through the aperture in the mirror H, and the rays oflight emanating from the lamp Faud reflected by the mirror H illuminatethe eye to such an extent that the observer can readily examine the eyeof the patient, it being understood that the desired lens or acombination of lenses I I is moved into axial alinement with theeyepiece D and sight-tube C, so that the observer views the eye throughthe said lenses. In order to relieve the other eye of the patient fromany undue strain, I provide the eyepiece end of the casing 13 with amirror Q, which reflects distant objects in the room, so that the eyenot under examination views such objects through the mirror, and henceis relieved of undue strain.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. A skiascope, having a sight-tube, and a pluralityof manually-controlled lenses, an independent carrier for each lens, andmeans for independently adjusting each into axial alinement with thesaid sight-tube, as set forth.

2. Askiascope, having a sight-tube, a lightsupply tube connected theretoat one end and at angles to the sight-tube, and a plurality of manuall'y-controlled lenses,an independent carrier for each lens, and meansfor independently adjusting each into axial alinement with thesight-tube at the end opposite 1the lone carrying the light-supply tube,as set ort 1.

3. A skiascope, having asight-tube, a lightsupply tube connected theretoat one end and at angles to the sight-tube, a plurality ofmanually-controlled lenses adapted to be moved independently into axialalinement with the sight-tube at the end opposite the one carrying thelight-supply tube, and an apertured slide under the control of theoperator and movable in the said light-supply tube, as set forth.

4. A skiascope, having pivoted frames each carrying a separate lens andnormallystanding in an inactive position, and means under the control ofthe operator for imparting an independent swinging motion to each of thesaid frames, to bring either one of the frames in axial active position,as set forth.

5. A skiascope, having a sight-tube, an eyepiece in alinement with thesaid sight-tube, pivoted lens-frames each carrying a separate lens andnormally standing in an inactive position relative to the saidsight-tube, and means under the control of the operator for impartingindependent swinging motion to each of the said lens-frames, to bringeither one of the lenses into an axial position relative to thesight-tube and eyepiece, as set forth.

6. A skiascope, havingasight-tube, an eyepiece in alinement with thesaid sight-tube, pivoted lens-frames carrying lenses and normallystanding in an inactive position relative to the said sight-tube, andmeans under the control of the operator for imparting independentswinging motion to the said lensframes, to bring either one of thelenses into an axial position relative to the sight-tube and eyepiece,the said means comprising spring-pressed slides, one for eachlens-frame, and a rock-shaft having arms at each end, one of the armsbeing connected with the said slide and the other with the saidlens-frame, as set forth.

7. A skiascope, having a sight-tube adapted to View one eye of thepatient, and a mirror outside the sight-tube and located on theskiascope, for reflecting distant objects to the other eye of thepatient, asset forth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

KIRK A. MOTT.

Witnesses:

S. A. BROWNING, D. J. DAVIS.

